The Forney 71834 9 in. (228.6 mm) x 1/4 in. (6.35 mm) with 5/8 in.-11 threaded arbor. A24R with MAX 6,500 RPM. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.